OF DENISON UNIVERSITY. 73 



Yards, very common. September 7, 1888; July 20, 1889; July 

 25, 1890; June 5, 1891. 



614. P. erectum L. 



Yards, very common. September 7, 1888; August 21, 1889; 

 July 25, 1890; June 20, 1891. 



615. P. lapathifolium L. 



Wet places, rather rare; Licking Reservoir. August 26, 1890; 

 August 9, 1 89 1. 



616. P. lapathifolium L. Var. incarnatum Watson. 

 Wet places, rare; Licking Reservoir. August 9, 1891. 



617. P. Pennsylvanicum L. 



Moist soil, common. August 27, 1888; September 14, 1889; 

 June 15, 1891. 



618. P. amphibium L. 



Growing in shallow water, rare; Licking Reservoir. August 10, 

 1891. 



619. P. Muhlenbergii Watson. 



Growing in shallow water, common at Licking Reservoir. 

 August 28, 1888; September 14, 1889; August 24, 1890; August 

 8, 1891. 



620. P. Hartwrightii Gray. 



Lieb's Island, New Reservoir; very rare. 



621. P. Careyi Olney. 

 Herbarium of Dr. F. O. Jacobs. 



622. P. orientale L. Prince's Feather. 



Sparingly escaped into waste places. September 9, 1891. 



623. P. Persicaria L. Lady's Thumb. 



Common everywhere. August 27, 1888; August 8, 1891. 



624. P- hydropiperoides Michx. Wild Water Pepper. 



Wet places, not 'common; Granger's Swamp. August 31, 1891. 



62=;. P- Hydropiper L. . Common Smartweed. 



Moist soil, everywhere. August 27, 1887; August 28, 1888; 

 July 9, 1890; July 25, 1891. 



626. P- acre H B K. Water Smartweed. 



Swamps, rather common. August 23, 1887; July 9, 1890; Sep- 

 tember 2, 1891. 



